This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A031689 #25 Jul 12 2021 02:04:06 %S A031689 123,488,1095,1944,3035,4368,5943,7760,9819,12120,14663,16152,17448, %T A031689 19344,20475,23744,27255,31008,35003,37284,39240,43719,48440,53403, %U A031689 53866,58608,59093,64055,64562,67128,69744,75675,81848,88263,94920,101819 %N A031689 Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 11. %H A031689 Charles R Greathouse IV, <a href="/A031689/b031689.txt">Table of n, a(n) for n = 1..10000</a> %t A031689 Select[Range[110000],!IntegerQ[Sqrt[#]]&&Min[ContinuedFraction[Sqrt[#]][[2]]]==11&] (* _Vincenzo Librandi_, Jan 27 2012 *) %Y A031689 Cf. A031424. %K A031689 nonn %O A031689 1,1 %A A031689 _David W. Wilson_ %E A031689 Content that was based on the incorrect assumption that a(n)=121*n^2+2*n removed by _R. J. Mathar_, Nov 18 2010